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Synthesis and complexing properties of 1,5:3,7-doubly bridged calix[8]arenes with mixed spanning elements |
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| Authors: | Luisa Gregoli Ivan Stefio Françoise Arnaud-Neu Poupak Khazaeli-Parsa Placido Neri |
| Institution: | a Dipartimento di Chimica, Università di Salerno, Via S. Allende 43, I-84081 Baronissi (Salerno), Italy b Laboratoire de Chimie Physique, UMR 7512 (CNRS-ULP), Ecole Européenne de Chimie Polymères et Matériaux, 25, rue Becquerel, 67087 Strasbourg Cedex 2, France c Istituto di Chimica Biomolecolare--Sezione di Catania, CNR, Via del Santuario 110, I-95028 Valverde (CT), Italy |
| Abstract: | Two different bridges were introduced at the 1,5:3,7-positions of p-tert-butylcalix8]arene 1 using a two-step alkylation procedure. A probable cation template effect in the introduction of the second bridge was evidenced. The obtained bis-bridged derivatives 3 possess encapsulating properties toward alkali cations modulated by the length and nature of the bridges. |
| Keywords: | Calixarenes Calix[8]arenes Intramolecular bridging Ionophores Association constants |
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